Introduced a few years ago, the notion of Advanced Persistent Threat refers to very complex targeted cyber-attacks. This appellation is however widely challenged by certain observers who do not hesitate to refer to â€śdisaster scenariosâ€ť. Is this a new marketing concept or a new cyber-espionage threat? Are these attacks always so â€śadvancedâ€ť?Â Or is their success due to the obvious vulnerabilities that continue to exist among victims?